The principal concomitants of psychomotor epilepsy have been well described by Gibbs, Gibbs, and Fuster (1948). According to them:"The chief clinical manifestations of psychomotor seizures may be described as follows The patient becomes confused and as a rule amnesic but does not usually lose consciousness. His movements appear purposeful but are poorly coordinated and his manner is frequently negativistic. In general his behaviour is that of a person acting out a bad dream.Often during the seizure therle are manifestations of fear or rage with screaming and shouting. tn most seizures the movements are simple, repetitive and more or less automatic."The patients with whom the present report is concerned were selected for operation (temporal lobectomy) " upon the evidence, first clinical, then electroencephalographic, that a single dominant focus existed in the anterior part of a temporal lobe; secondly, that the seizures had not been controlled by adequate anticonvulsant therapy" (Hill, 1953).During the course of routine psychological testing, it was observed that some of the patients who underwent the operation showed a gross learning deficit on certain psychological tests, although their intelligence level as measured by other tests showed no decline. For this reason, a testing programme gradually developed which was aimed at clarifying the nature of this deficit and establishing its reliability. The present paper presents preliminary findings on a number of patients with respect to intellectual changes before and after the operation. Since the investigation developed gradually out of clinical requirements, not all of the patients have been given all of the tests.
Review of the LiteratureThe literature concerned with the effects of temporal lobectomy is relatively sparse, particularly where the operation is performed for the relief of focal epilepsy without complicating factors such as tumours. Reports on psychological changes following the operation are both infrequent and usually quite inadequate, in so far as the need for statistical tests of significance is ignored and the possible influence of various relevant factors left uncontrolled.In the most recent work attention has been mainly confined to consideration of the effects of the operation on the number of fits the patient suffers, and the possible intellectual changes resulting from this operation have been largely ignored or discussed in very general terms. Thus, Bailey and Gibbs (1951) reported on the post-operative status of 25 cases where the disturbance was confined to one lobe. They reported that no aphasic disturbances took place, but although intelligence and other psychological tests were given, no results were reported. Green, Duisberg, and McGrath (1951) investigated pre-and post-operatively 23 patients failing to respond to systematic medical therapy and demonstrating spontaneous electroencephalographic spiking in the anterior temporal areas. Although